On March 29, 2013, in the middle of a large loading dock at the port of Miami, former U.S. President Barack Obama was set to deliver a key speech on promoting U.S. infrastructure development. But minutes before his speech started, a big gust of wind blew off an American flag that had been strapped to one of the container cranes. An event staffer quickly tried to fix it, but gave up and took the flag away. Now, observers could see the label behind it: “ZPMC” and the Chinese characters “�